GERC and GOZ Collets

The right one for any requirement

FAHRION provides the largest range of forms and executions of collets DIN6499/ISO15488 (ER/ESX) for different applications.

Precise

FAHRION collets DIN6499/ISO15488-B (ER/ESX) set the standard of concentricity and repeatability, which is 5μm for the types GER11-B up to GER40-B and 2μm for the types GER11-HP up to GER40-HP.

Rigid

12 slots are sufficient in order to reach the required collapse to DIN6499/ISO15488. This is possible because of a special steel produced for us and a particular harmonized heat treatment. Compared to 16 slot collets, our collets have less tendency to distort.

Saving

All edges are not only deburred, but additionally rounded, which is a prerequisite to protect the inner cone of the collet chuck from marks. Thus, we guarantee consistent concentricity at the highest level.

FAHRION trademark

Only original FAHRION collets forms GER-B, GER-HP and GER-GB are indicated by this trademark.

Customer benefits

Thanks to their super-finished execution, our precision collets GER-B and GER-HP offer you the following advantages:

Increased rigidity and clamping forces
improved grip
higher precision and system concentricity
enhanced resistance to corrosion

What do you gain?

Increased tool working life, lower tool costs, less setting up time —> Lower production costs
Better surface finishes and tighter production tolerances —> Improved quality

Concentricity

Effect of runout on the cutting edges:

Concentricity for collets DIN ISO15488 (ER/ESX)

The tolerances are classified to DIN into two classes:

Class 2 is our standard for forms K2 and ET
Class 1 (higher TIR) is our standard for forms D and GB
FAHRION quality is our standard (average concentricity with a repeatability of 5μm resp. 2μm) for forms B and HP

Test method (except for HP) see below:

For applications which require highest concentricity, it is absolutely necessary to pay attention to the complete system (machine spindle, collet acceptance, clamping nut, collet and cutting tool).

Cost example

for a carbide drill Ø 12 mm with collet DIN SO15488- GER32-B (470 E)

Example 1: system concentricity ≤ 10 μm

Cost of a carbide drill: approx 80 EUR
Cost FAHRION GER32-B collet with concentricity 5 μm: approx. 17 EUR
Cost on basis of tool life of approx. 150 %: approx. 97 EUR

Example 2: system concentricity 25 μm

Cost of a carbide drill: approx. 80 EUR
Cost CER32-K2 collet class 2 with concentricity 20 μm: approx. 8 EUR
Cost on basis of tool life of approx. 55 %: approx. 88 EUR
Cost for similar tool life of approx. 150 %
More than two carbide drills necessary! approx. 238 EUR

Result: Cheap collets almost triple the costs!